Interferon-γ –Receptor Deficiency in an Infant with Fatal Bacille Calmette–Guérin Infection

Abstract

The attenuated strain of Mycobacterium bovis bacille Calmette–Guérin (BCG) is the most widely used vaccine in the world. In most children, inoculation of live BCG vaccine is harmless although it occasionally leads to a benign regional adenitis.¹ In rare cases, however, vaccination causes disseminated BCG infection, which may be lethal. Impaired immunity of the host is generally thought to be the pathogenic mechanism. Disseminated BCG infection has been reported in children with inherited immune disorders. Most of these children had severe combined immunodeficiency, which is characterized by an absence of T cells, and some had chronic granulomatous disease, which is marked by an impairment of the phagocyte respiratory burst.^2,3 Rare cases of BCG infection have also been reported in association with the acquired immunodeficiency syndrome.²